Final answer:
The STA-21 Program is an enlisted commissioning program for U.S. Navy sailors who wish to become Officers while earning their degree, with all expenses paid and continuation of military benefits.
Step-by-step explanation:
The Seaman to Admiral (STA-21) Program is best described by the phrase 'Enlisted commissioning program'. This program is an initiative of the United States Navy, which offers enlisted members the opportunity to earn a commission as a Navy Officer while completing their bachelor's degree. The STA-21 Program provides a pathway for highly qualified and motivated sailors to transition from enlisted status to becoming a Naval Officer, providing full tuition and educational expenses coverage at a college or university with the added benefit of receiving military pay and benefits.
As part of the program, candidates continue to receive their regular pay and may be eligible for additional benefits. Participants attend college full-time, and upon completion, they are commissioned as Officers. Not only does the STA-21 serve as a career advancement opportunity, but it is also a testament to the Navy's commitment to the personal and professional development of its service members.